package org.bouncycastle.asn1.cms;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.BERSequence;
import org.bouncycastle.asn1.BERTaggedObject;
import org.bouncycastle.asn1.DEREncodable;
import org.bouncycastle.asn1.DERObject;

public class ContentInfo extends ASN1Encodable
// BEGIN android-removed
// implements CMSObjectIdentifiers
// END android-removed
{
    private ASN1ObjectIdentifier contentType;
    private DEREncodable content;

    public static ContentInfo getInstance(Object obj) {
        if (obj == null || obj instanceof ContentInfo) {
            return (ContentInfo) obj;
        } else if (obj instanceof ASN1Sequence) {
            return new ContentInfo((ASN1Sequence) obj);
        }

        throw new IllegalArgumentException("unknown object in factory: "
                + obj.getClass().getName());
    }

    public ContentInfo(ASN1Sequence seq) {
        if (seq.size() < 1 || seq.size() > 2) {
            throw new IllegalArgumentException("Bad sequence size: "
                    + seq.size());
        }

        contentType = (ASN1ObjectIdentifier) seq.getObjectAt(0);

        if (seq.size() > 1) {
            ASN1TaggedObject tagged = (ASN1TaggedObject) seq.getObjectAt(1);
            if (!tagged.isExplicit() || tagged.getTagNo() != 0) {
                throw new IllegalArgumentException("Bad tag for 'content'");
            }

            content = tagged.getObject();
        }
    }

    public ContentInfo(ASN1ObjectIdentifier contentType, DEREncodable content) {
        this.contentType = contentType;
        this.content = content;
    }

    public ASN1ObjectIdentifier getContentType() {
        return contentType;
    }

    public DEREncodable getContent() {
        return content;
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     * 
     * <pre>
     * ContentInfo ::= SEQUENCE {
     *          contentType ContentType,
     *          content
     *          [0] EXPLICIT ANY DEFINED BY contentType OPTIONAL }
     * </pre>
     */
    public DERObject toASN1Object() {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(contentType);

        if (content != null) {
            v.add(new BERTaggedObject(0, content));
        }

        return new BERSequence(v);
    }
}
